Presser belt for vulcanizing machines



April 24, 1934. I SCHRADER ET AL 1,955,545

PRESSER BELT FOR VULCANIZING MACHINES Fi led Oct. 4, 1953 Lvmmrwzs A, Scmazoaz,

Patented Apr. 24, 1934 UNITED STATES PRESSER BELT FOR VULCANIZINGMACHINES Ernst Schrader, Hanover, Heinrich Windhorn,

Hanover Buchholz,

and Hermann Meyer,

Hanover-Kleefeld, Germany Application October 4, In Germany 2 Claims.

This invention relates to a presser belt formed by a rope belt forvulcanizing machines. In vulcanizing machines, it is known, the rubberarticles to be treated, for instance rubber sheets, rubberized fabric orrubber flooring, are guided over heated cylinders or rollers, againstthe outer wall of which the article to be vulcanized is pressed by meansof a strong endless presser belt. Hitherto for this purpose rubberizedfabric or endless sheet belts and also belts of metallized fabric havebeen used.

In accordance with the invention a presser belt consists of an endlessrope belt which is composed of a number of wire ropes lying side byside. These ropes are of alternately right and left twist and areconnected together by transverse binding wires. Each of the individualropes consists of four strands and the transverse binding wire is passedthrough each rope always at a point where the line of centers of thecrosssections of two adjacent strands is horizontal. In this way thebinding wire traverses the whole of the belt without being bent.

In order that the invention may be readily understood it will now bedescribed with reference to the accompanying drawing, in which Figure 1illustrates diagrammatically a vulcanizing machine comprising the usualvulcanizing cylinder 11 adapted to be heated, guide rollers e, f, andtensioning roller 9. v

The band-7L to be vulcanized passes over the vulcanizing cylinder 11 incontact therewith and is pressed against the said cylinder by means ofthe presser belt 2'. The belt 1 passes over the guide rollers e and fand the tensioning roller 9. By suitably urging the tensioning roller inthe direction of the arrow the belt 2 will be caused to apply itselffirmly against the band h to be vulcanized and press the latter firmlyagainst the cylinder at.

Figure 2 is a view in side elevation of a presser belt constructed inaccordance with the inven- Figure 3 being a plan view thereof,

Figure 4 is an enlarged diagrammatic view in cross-section through oneof the wire ropes taken at a point where the rope is traversed by thebinding wire, and

Figure 5 is a transverse section of the belt in modified form.

Referring 'now to Figures 2, 3, and 4 of the drawing, it will be seenthat the presser belt is composed of a number of adjacent ropes a, b,which have alternately a right and left twist.

1933, Serial No. 692,194 August 1, 1932 The ropes a, b are eachcontinuous. The transverse connection of the ropes is effected by meansof binding wires 0, which pass through the middle of the wire ropes a,b. Each wire rope is composed of four strands and the wire 0 is passedthrough each rope always at a point where it is possible'to do sowithout bending the wire, that is to say where the line of centres ofthe cross sections of two adjacent strands is horizontal. (This isclearly illustrated in Figure 3.) The transverse binding wires 0 passthrough continuously as shown in Figure 2. Preferably steel wire isselected, both for the wire ropes and for the transverse binding wire.

The construction of the endless belt can be effected by guiding thepairs of wire ropes a, b over exactly adjusted and immovably journalledrollers, the ends being secured in a suitable manner, and thenconnecting the ropes by the transverse wires c.' In this way anextremely durable and uniform construction is obtained. In order toobtain a uniform surface, the rope belt may be covered with a resilientlevelling material, for instance a rubber mass m as shown in Figure 5.

The new belt is particularly suitable as a presser belt for vulcanizingmachines, because it can withstand sharp flexing and high stresses. Thepresser belts hitherto known will not withstand these high stresses.

Having now described our invention, what we claim as new and desire tosecure by Letters Patent is:

1. As a presser belt for a vulcanizing machine, an endless rope beltcomposed of adjacent wire ropes each formed from four strands, the ropeshaving alternately right and left twists and being connected together bytransverse binding wires,

said wires passing through each rope and between the strands always at apoint where the line of centres of the cross-sections of two adjacentstrands is horizontal.

2. As a presser belt for vulcanizing machines, an endless rope beltcoated with resilient levelling material, said belt being composed ofadjacent wire ropes each formed from four strands, the ropes havingalternately right and left twists and being connected together bytransverse binding wires, said wires passing through each rope andbetween the strands always at a point where the line of centres of thecross-sections of two adjacent strands is horizontal.

ERNST SCI-IRADER. HEINRICH WINDHORN. HERMANN MEYER.

